Pencil sharpener



AFiled April 1'7, 1924 Patented 7, 1925.

Y UNITED STATES PATENTv OFFICE.

ERNST WEILER, F BERLIN, GERMANY, ASSIGNOR 0F ONE-HALF TO WEILER & CO.,

G. 1VI.` 1B. H., OF BERLIN, GERMANY.

PENCIL SHARPENER.

Application filed April 17, 1924.. Serial No, 707,237.

TocZZ Iwhom t 'may concern:

Be it known that I, ERNST VVEILER, a citizen o't the German Republic, residing at Berlin, Germany, have invented certain Iniproveniente inPencil Sharpeners, for which I have iilled an application in Germany on October 18th, 1922, and of which the following is a specification.

This invention relates to a pencil sharp ener of the kind litted with cutters which revolve about their own axes as well as about the. pencil point, and the invention consists in the provision ot means for imparting, in addition, an axial, reciprocating motion to the cutters so as to produce a very smooth cutting' action. Y

Fig. 1 of the accompanying drawings represents a longitudinal section of the device,

Fig. 2, an end View of the same,

Fig. 3, a longitudinal section ot a modilied construction, and

Figs. 4c and 5, detail views ot the latter construction.

The mechanical elements of the pencil Sharpener are carried by a (lished plate 6 which is secured in an upright position to a clamp 2, thelatter being fitted with a screw-threaded socket t for the reception of a clamp screw 5 whereby the device can be fastened to a table top 1.V A transparent cylinder 7, connected to the plate 6, encloses the elements. The plate 6 has a central aperture in which it accommodates a boss formed on a rotatable disc 10. The latter is arranged inside the plate 6, While an operating arin l1, Fitted with a crank handle 12, is secured to the boss outside the plate.

In the construction according to Figs. 1 and 2, a ring 8, Ytermed with an inturned, toothed flange 9, is rigidly secured to the plate while a disc 8 is connected to the disc l0 so as to rotate with. the latter. The disc S carries, at right angles, a plate 13 to which a conical shell 14; is attached as a guide 'lor the pencil. An upright plate 16 secured to the free end of the plate 13, has an aperture 16a through which the pencil .is admitted. Another plate 17, which is adjustable about a pivot pin 1.5, has an aperture 17a which registers with the aperture 16a. By the adjustment of this plate, the eii'ective area of the inlet aperture can be varied to suit pencils of different` sizes. The adjustment .et the plate 17 ie effected bv means of an arm 18 which projects through the end et the cylinder 7.

A milling cutter 21 is arranged loosely on a spindle 2O one end 23 ot which is screwed into a socket formed on the disc 8C The other end oi the spindle is held in an aperture in an upward extension-19 ot' the plate 1G, the spindle being held in an inclined position inconformity with the angle at which the pencil is to `be cut. The spindle is supported by a bracket 27, bent oft from the plate aperture, and its inclination can be regulated by means oi an adjusting screw 26. The cutter is coaxial with a cylindrical shell 22 to which it is connected, the shell being slotted longitudinally so as to form ribs which are heldin mesh with the teeth of the flange 9. Thus when the plate 13 and the spindle 2O are rotated about the pencil point by means of the handle 12, the cutter, while participating in themovement of the spindle, will also be rotated about its axis by the stationary gear 9.

According to the invention, the cutter is adapted for axial displacement on the spindle, and it is controlled by a spring 24 which is housed in the shell 22 and which bears against the disc 8. The opposite endk of the cutter bears, under the influence oi the spring, against the plate 19 by means of a roller 25 which is connected to the cutter so as to participate in its rotation about the spindle. The plate 19 is set at an angle to the spindle 20, and the cutter will therefore be caused to change its position axially on the sp-indle in a reciprocating fashion as it rotates about its axis. A vey favorable cutting action will thus resu t.

Figs. 3 to 5 show a modied device in which three cutters 21, 2lb and 21are einploycd. These are held rotatably and slidably on spindles 20 which are secured to the disc 10 through the medium ci. anv oit set plate 23. The spindles are spaced uniformly and arranged relativeJ to each other at an angle which corresponds with the pencil point. The cutters are drilled from one end to receive the spindles as well as a spring 24. The opposite end of each cutter is fitted with a pinion 22a which meshes with ribs formed by'slots made in a conical portion 9a of av cylinder 8a, the latter being secured to the plate 6A The cutters are sup? ported, in opposition to the springs, by a disc 28 which arranged oblique-ly Within the cylinder portion L and .held in position by .lugs 29 which are bent oil" trom the cylinder wall. The -discQS Vhas -an aperture through which the pencils Yaire inserted, and a flanged nipple 30 is arranged about the aperture as a guide 'tor a spider 3l which supports the tree ends of the cutters and rotates with the latter about the pencil. The cutters are formed with journals 33 which rest iin notches 32 made in the arms oit the spider, and balls or rollers '34 at theexftreine ends of the cutters 'bear against and travel on the 'suritace of the oblique disc 28 so as to impartan axial, reciprocating nio'tion to the cutters While they are circulated `by means of the handle 12 about the pencil point. The p'inion 2Q` impart `a rotary motion to "the cutters While participating in their 'axial displacement.

claim:

1..In a @pencil 'Sharpener of the character described, "the combination with cutters 'adapted 'to revolve about `their axes `as Well as about vthe pencil point, ol springs (euding to impart =axial lnotironvto the cutters, and a plate arranged so as `to oppose such motion, the plate being arranged obliquely relative `to the :of rotation voff vthe lcutters so as to impart an axial reciprocating motion to the cutters iu cooperation with tthe rsprsings.

'cutters rotary motion about their axes While circulating'round the pencil point, springs tending to `impart axial n'ioti-o'n to the cutters, and a plate arranged so as Vto oppose such axial motion, the plate being `arranged at an angle relative t0 the axis about which the spindles rotate so as to `Vimpart an axial reciprocating motion to the cutters in cooperation with the springs.

ERNSM TVELER 

